A modulated positioning scheme for asymmetric vibration sensor using high-frequency carrier

Ultra-long-range modulated asymmetric vibration sensor based on high-frequency carrier

“…However, the symmetry of the system cannot maintain in a long time due to the environmental noise and the optical structure to ensure the high similarity of the system. To solve this problem, we proposed a modulated asymmetric dual Mach-Zehnder interferometer system using a high-frequency carrier scheme, which guaranteed high localization accuracy by maintaining the signal bandwidth while still being effective for low-frequency, small-amplitude weak signals [4]. In this paper, to further enhance the sensing range, we choose the erbium-doped fiber amplifier (EDFA) post-amplification in the system to amplify the interference signal.…”